Original Bose 901 Internal Wiring Diagram

[sdep777]

this is a series/parallel square. Used for 8ohm drive units, how to wire 9 full range drivers .

 

[Scottmoose]

Possibly of interest if you'd remembered to attach the diagram 😉 (although Bo$£ is an evil word around here... )

 

[sdep777]

bose

diagram

 

[sdep777]

Bose 901 Wire Diagram

This is the Original 901 Wire Diagram , all Drive units were 8ohm

 

[Scottmoose]

Where?

 

[Scottmoose]

There appears to be nothing in the txt file.

 

[Cal Weldon]

Series I and II (up to 1976) were 8 ohm drivers wired three in series and the three sets then paralleled. From Series III onward they were 1 ohm drivers all wired in series.

 

[sdep777]

I can NOT get this pdf to attach,anyone who wants it email me and I can email it to You , it will go has no problems attaching to email.

 

[Cal Weldon]

Send it to me and I'll see if I can

 

[Cal Weldon]

here it is, i just downsized it a bit

 

[Jrat]

do all 901's have a 9th drive

 

[Cal Weldon]

Yes but let's just stick to one thread ok?

 

[Jrat]

Sry first time using this. I don't have a multitester. any other advise?

 

[Cal Weldon]

Yes, go get one. You can't do any wiring without knowing at least the DC resistance. Don't even try.

 

[Jrat]

Ok I have some reseach to do. this doesn't sound like its going to be easy!

 

[Jrat]

how do i get to that 9th drive. it was not visible when i removed the others?

 

[Cal Weldon]

It's on the other side. 8 face backward and 1 forward. If you have only 8 drivers, you don't have 901's, you have an 800 series. They look similar

 

[Cal Weldon]

Ok I have some reseach to do. this doesn't sound like its going to be easy!

Yes it is if you happen to know the driver DC resistance.

 

[Jrat]

Do you get at the front speaker from the front or back? the front panel does not seem to be coming off and i would hate to reuin it.

 

[Cal Weldon]

I don't know.